EP1389848A1 - Hybrides automatisches Wiederholungsaufforderungsprotokoll - Google Patents

Hybrides automatisches Wiederholungsaufforderungsprotokoll Download PDF

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Publication number
EP1389848A1
EP1389848A1 EP02018086A EP02018086A EP1389848A1 EP 1389848 A1 EP1389848 A1 EP 1389848A1 EP 02018086 A EP02018086 A EP 02018086A EP 02018086 A EP02018086 A EP 02018086A EP 1389848 A1 EP1389848 A1 EP 1389848A1
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EP
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Prior art keywords
reserved
harq
harq processes
additional
processes
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EP02018086A
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English (en)
French (fr)
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EP1389848B1 (de
Inventor
Dragan Petrovic
Eiko Seidel
Christian Wengerter
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to EP10154980.6A priority Critical patent/EP2184884B1/de
Priority to EP02018086A priority patent/EP1389848B1/de
Priority to EP06015626A priority patent/EP1710946B1/de
Priority to AT02018086T priority patent/ATE349829T1/de
Priority to DE60217098T priority patent/DE60217098T2/de
Priority to AT06015626T priority patent/ATE467958T1/de
Priority to DE60236377T priority patent/DE60236377D1/de
Priority to CNB038241358A priority patent/CN100375420C/zh
Priority to CN200810003733.5A priority patent/CN101222308B/zh
Priority to PCT/EP2003/006627 priority patent/WO2004019544A1/en
Priority to US10/524,141 priority patent/US7471693B2/en
Priority to AU2003238037A priority patent/AU2003238037A1/en
Priority to JP2004529977A priority patent/JP4312716B2/ja
Publication of EP1389848A1 publication Critical patent/EP1389848A1/de
Publication of EP1389848B1 publication Critical patent/EP1389848B1/de
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1887—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
    • H04L1/0083—Formatting with frames or packets; Protocol or part of protocol for error control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1822—Automatic repetition systems, e.g. Van Duuren systems involving configuration of automatic repeat request [ARQ] with parallel processes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1803—Stop-and-wait protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H04L1/1819—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of additional or different redundancy
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1835—Buffer management
    • H04L1/1845—Combining techniques, e.g. code combining

Definitions

  • This invention relates to incremental redundancy or hybrid ARQ Type II or III retransmission techniques in mobile communications systems and is particularly applicable to cellular systems.
  • ARQ Automatic Repeat request
  • FEC Forward Error Correction
  • SAW stop-and-wait
  • SR selective-repeat
  • a data unit (PDU) will be encoded before transmission.
  • PDU data unit
  • three different types of ARQ are e.g. defined in S. Kallel, R. Link, S. Bakhtiyari, IEEE Transactions on Vehicular Technology, Vol. 48 #3, May 1999 "Throughput Performance of Memory ARQ Schemes”.
  • This invention is related to Type II and Type III schemes, where the received (re)transmissions are combined.
  • These schemes can be seen as a link adaptation technique, since the redundancy can be adapted according to the channel conditions as for example described in 3GPP TSG RAN, "Physical Layer Aspects of High Speed Downlink Packet Access TR25.848 V5.0.0” and in Amitava Ghosh , Louay Jalloul, Mark Cudak, Brian Classon, "Performance of Coded Higher Order Modulation and Hybrid ARQ for Next Generation Cellular CDMA Systems", Proceedings of VTC 2000.
  • AMC adaptive modulation and coding
  • Modulation Coding Scheme MCS
  • the packet size depends on MCS level and number of orthogonal codes allocated for a particular transmission. Reference will be made to the MCS level and number of codes as Transport Format and Resource Combination (TFRC).
  • TFRC Transport Format and Resource Combination
  • a transmission will be split into Transmission Time Intervals (TTI), whereas the MCS level could change each TTI interval (for HSDPA the TTI is equal to 2 ms).
  • TTI Transmission Time Intervals
  • HSDPA the TTI is equal to 2 ms.
  • a bit combining method also influences the robustness of packets to the transmission errors.
  • Incremental Redundancy There are different combining schemes, Chase Combining (CC) and Incremental Redundancy (IR), that can be used for bit combining.
  • Chase Combining always the same information and parity bits are sent to be combined and every version of packet is self decodable.
  • the set of parity bits is always obtained by using the same puncturing scheme.
  • Incremental Redundancy may use different sets of parity bits (obtained by different puncturing schemes) in consecutive packet transmissions. All these groups of bits obtained from different transmissions have to be stored in the soft buffer for combining. Hence, Incremental Redundancy provides more reliable transmission at the expense of increased soft buffer memory requirements.
  • UMTS Universal Mobile Telecommunication System
  • the network elements are functionally grouped into Core Network (CN), UMTS Terrestrial Radio Access Network (UTRAN) and User Equipment (UE).
  • CN Core Network
  • UTRAN UMTS Terrestrial Radio Access Network
  • UE User Equipment
  • UTRAN is responsible for handling all radio-related functionality
  • CN is responsible for routing calls and data connections to external networks.
  • the interconnections of these network elements are defined by open interfaces as can be seen in the Figure. It should be noted that UMTS system is modular and it is therefore possible to have several network elements of the same type.
  • FIG. 2 illustrates the current architecture of UTRAN.
  • a number of RNCs Radio Network Controllers
  • lub wired or wireless links (lub) to the CN.
  • Each RNC controls one or several base stations (Node Bs) which in turn communicate via wireless links (not shown) with the UEs.
  • High Speed Downlink Packet Access is a new technique that is standardised (see for example, 3GPP TSG RAN "Physical Layer Aspects of High Speed Downlink Packet Access TR25.848" V5.0.0 or 3GPP TSG RAN TR 25.308: “High Speed Downlink Packet Access (HSDPA): Overall Description Stage 2", V5.2.0). It shall provide higher data rates in the downlink by introducing enhancements at the Uu interface such as adaptive modulation and coding. HSDPA relies on hybrid Automatic Repeat Request protocol (HARQ) Type II/III, rapid selection of users which are active on the shared channel and adaptation of transmission format parameters according to the time varying channel conditions. The invention is particularly applicable to HSDPA but is not restricted to this system. Therefore the data transmission does not necessarily have to be in the downlink nor does it depend on a particular radio access scheme.
  • HARQ hybrid Automatic Repeat Request protocol
  • the User Plane Radio Interface Protocol Architecture of HSDPA is shown in Figure 3.
  • the HARQ protocol and scheduling function belong to the Medium Access Control High Speed (MAC-hs) sublayer which is distributed across Node B and UE.
  • MAC-hs Medium Access Control High Speed
  • RLC Radio Link Control
  • Parameters of the protocols are configured by signalling in the control plane. This signaling is governed by a Radio Resource Control (RRC) protocol.
  • RRC Radio Resource Control
  • RAB Radio Access Bearer
  • Each RAB is subsequently mapped to a service offered from MAC layer. This service is referred to as Logical Channel (LC).
  • LC Logical Channel
  • the performance of high speed packet transmission may depend on technical characteristics of the mobile UE capabilities. These could be signaled from the UE entity to the RNC entity during connection establishment using the RCC protocol.
  • Radio Link Control A scheduler is located in Node B so that retransmissions can be rapidly requested thus allowing small delays and high data rates.
  • a physical channel is used to transmit data to a receiver.
  • HS-DSCH High Speed - Downlink Shared Channel
  • UE1 User Equipment
  • Tx a data packet A to the UE1.
  • Rx User Equipment
  • UE1 will demodulate and decode the packet A.
  • an ACK or NAK will be sent (depending on if the packet A has been received correctly or not).
  • UE1 sends a NAK assuming that Packet A has not been received correctly. If the NAK has been received and decoded correctly by the transmitter (t propa introduced once again by the radio channel), the transmitter can decide to resend the data packet after a processing time t TX process .
  • the number of data packets that have to be stored depends on the number of simultaneously active HARQ processes.
  • a high level architecture of HSDPA Base Station is depicted in Figure 5. It is assumed there are #1...# X different data flows (logical channels) with data packets to be transmitted from the Node B to the User Equipment (UE).
  • the set of HARQ transmitting and receiving entities, located in Node B and UE respectively, will be referred to as HARQ processes.
  • the maximum number of HARQ processes per UE is usually predefined.
  • QoS Quality of Services
  • the scheduler will consider these parameters in allocating resources to different UEs.
  • the scheduling function controls the allocation of the channel (HS-DSCH) to different users or to data flows of the same user, the current MCS level in one TTI and manages existing HARQ instances for each user.
  • a data flow or even a particular packet of a data flow may have a different priority. Therefore the data packets can be queued in different priority queues. Different data flows with similar QoS requirements may also be multiplexed together (e.g. data flow #3 and #4).
  • HS-DSCH that carries the data packets there is control data which is mapped onto a High Speed - Shared Control Channel (HS-SCCH). This could carry data such as the HARQ process ID, the modulation scheme, code allocation, transport format etc. that is needed by the receiver to correctly receive, demodulate, combine and decode the packets.
  • the scheduler decides which of the N HARQ processes shall be used for transmission.
  • Each HARQ process can have different window sizes.
  • HSDPA there is only a single HARQ process scheduled each TTI and each process works as a SAW protocol which corresponds to selective repeat ARQ with window size 1.
  • TTI transmission time intervals
  • the HARQ process number as well as the sequence number has to be signalled separately to allow a proper combining even if the packet is not received correctly.
  • the 1 bit sequence number is called New Data Indicator (NDI). Each time a new packet has been sent, the NDI is incremented.
  • the HARQ process ID and the NDI are signalled on the HS-SCCH.
  • each packet has a Transmission Sequence Number (TSN) for reordering of correctly received packets.
  • TSN Transmission Sequence Number
  • This information is signalled inband (of the HS-DSCH) in an header that is part of the packet.
  • the TSN is increased for new each packet that is send by the transmitter.
  • the receiver will check the TSN after successful decoding of an packet and deliver the packet only to higher layer if there is no previous packet of that data flow missing.
  • the received packet will be stored in the reordering buffer to wait for outstanding packets and to ensure in sequence delivery to higher layer. If the reordering buffer is full because the receiver is waiting for an outstanding packet for a long time the transmission must be stopped to avoid dropping or overwriting of packets. This situation is called stalling and can reduce the data throughput significantly.
  • the stalling can be mitigated by different means such as time out timer, window forwarding etc.
  • the receiver recognizes that it will not receive certain packets anymore and continues operation.
  • a retransmission has a higher priority compared to new transmissions to reduce overall delay.
  • a packet will be scheduled every 6 TTI for successive erroneous decoding.
  • a basic method is to adapt the number N of HARQ processes or the window size of a ARQ process to the round trip time.
  • a practical implementation in this case would be an N channel Stop-and-Wait ARQ process.
  • Continuous transmission while considering the round trip delay can be assured by switching between the HARQ processes every TTI.
  • a new transmission can be initiated on a HARQ process at any time even though there is a retransmission pending for that process. This will cause the UE soft buffer of the process to be flushed.
  • the number of HARQ processes is chosen according to the round trip delay to provide continuous transmission while minimizing the number of processes.
  • the window size be selected according to the RTT for window based ARQ mechanisms. Since the RTT can vary during transmission so the initial configuration may not be optimum anymore.
  • a scheduler may preempt a certain transmission according to QoS attributes (priority, delay requirement, guaranteed bit rate and other parameters) known by the scheduler.
  • QoS attributes priority, delay requirement, guaranteed bit rate and other parameters
  • the formulation preemption of higher priority data over lower priority data will be used in the following although the reason for preemption may be a QoS attribute other than priority (e.g. delay requirement).
  • the transport format e.g. transport block size
  • resource combination e.g. number and index of codes
  • different MCS levels and thus packet sizes can be scheduled.
  • each HARQ process is assigned a certain amount of soft buffer memory for combining the bits of the packets from outstanding retransmissions.
  • the reordering buffer provides the in-sequence delivery to RLC sublayer.
  • the reordering queue is tied to a specific priority.
  • the available soft buffer size depends on the UE radio access capability parameters. Processing time of UE for a certain MCS level and minimum inter-TTI interval (minimum time between two successive scheduling instants) can also be considered as capability parameters. These are signaled from the UE to the RNC by RRC protocol and further from RNC to Node B.
  • Soft buffer memory that is required for one HARQ process depends on the following:
  • Radio resource signalling such as to prepare for or to carry out handover when changing the serving cell.
  • Other radio resource management information may also be scheduled in-between of data transmission. This signalling is usually of low rate, but has to be very fast to avoid packet or even call drops.
  • downlink messages are generally significantly larger than uplink messages since they typically include more parameters as described in more detail in 3GPP TSG RAN TS 25.331 "RRC Protocol Specification", V 5.0.0.
  • the signalling between RNC and UE using radio bearers mapped on dedicated channels is slow due to delays in the transport network between RNC and Node B and due to a larger TTI of dedicated channels.
  • signalling radio bearers configured for downlink interactive traffic with a peak rate of 2048 kbps is configured with a payload in RLC packets of 136 bits and a TTI of 40 ms, that is with data rate of 3.4 kbps.
  • signalling delay is 390 ms, assuming transport network delay of approximately 30 ms.
  • HSDPA TTI is equal to 2 ms and minimum inter-TTI interval is equal to 2 ms, signaling delay is 20 ms assuming 2 retransmissions per packet.
  • the Node B receives low rate and delay sensitive data such as higher priority signaling, it will switch to the reserved or additional HARQ processes (if required), instead of using engaged HARQ processes which would cause the UE soft buffer to be flushed. Furthermore the Node B or RNC will signal to use a separate reordering queue for such data to avoid delays caused by reordering for in sequence delivery.
  • any HARQ process can be used for any priority queue.
  • Some HARQ processes may be limited for specific data flows of high priority or small transport format and resource allocation, while other HARQ processes may maintain full flexibility.
  • Such HARQ processes of limited use will be called reserved HARQ processes. By this it is ensured that high priority data can be sent without waiting for completion of outstanding retransmissions or flushing the UE soft buffer of an HARQ process.
  • additional HARQ processes which may also have limited functionality are in the following called additional HARQ processes.
  • the limited functionality will most likely be caused by reserving smaller soft buffer sizes for additional HARQ processes.
  • additional processes may support less reliable transmission (Chase combining instead of Incremental Redundancy).
  • RTT variation of RTT shall be monitored by the Node B in order to dynamically configure reserved processes. If RTT decreases, smaller number of HARQ processes is needed. Thus, more functionality (higher maximum supported MCS, Incremental. Redundancy instead of Chase Combining) can be allocated to additional processes. Should RTT increase, higher number of HARQ processes is needed. This, for example, may require further reduction in functionality of additional processes.
  • Additional HARQ processes also cause an increased signalling range for identifying the HARQ process to the UE.
  • the signalling of the HARQ process ID via a shared control channel is usually done by a fixed number of bits. Additional bits for the signalling may not be necessary because the number of HARQ processes that can be signalled is in the range of the power of two (e.g. 8 HARQ processes).
  • the method of configuring an additional HARQ process consequently requires that additional soft buffer memory is reserved for combining.
  • additional soft buffer memory is reserved for combining.
  • the soft buffer size for such limited HARQ processes is minimized.
  • An additional advantage of adding an HARQ process resides in the fact that all ongoing regular HARQ processes are not affected and that consequently the data throughput is not reduced.
  • Reservation or addition of HARQ processes enables delivery of delay sensitive high priority data. However, it is also necessary to define the strategy that is used in transmitter's scheduler for these cases.
  • the object of the present invention is consequently to provide a method of managing a plurality of parallel hybrid ARQ processes in a mobile communication system, which allows intelligent scheduling for efficiently support data flows of different priorities. This object is solved by a method as defined in claims 1 and 7.
  • the transmitter checks the state of all available HARQ processes and if all regular processes are ongoing, i.e. are in the state of combining packets, reserved or additional ARQ processes shall be used. This decreases the latency for packets having high priorities and moreover efficiently uses the available radio resources.
  • the scheduler in the transmitter shall select the HARQ processes, which includes additional HARQ processes, reserved HARQ processes or just HARQ processes with limited soft buffer capabilities.
  • the scheduling is performed in accordance with at least one resource allocation parameter which could be one of Modulation Coding Scheme (MCS) level, transport format, e.g. packet size, traffic transcriptor, priority, data flow ID or logical channel ID.
  • MCS Modulation Coding Scheme
  • transport format e.g. packet size, traffic transcriptor, priority, data flow ID or logical channel ID.
  • the use of reserved or additional HARQ processes may be restricted to signalling having a separate data flow ID or to data packets of high priority.
  • a traffic descriptor could for instance indicate the kind of data (e.g. control data, radio resource control, SIP signalling etc.) to the transmitter. Based on this, the transmitter knows the characteristics of that data and how it shall be transmitted. Thus a proper selection of the HARQ channel can be performed.
  • data e.g. control data, radio resource control, SIP signalling etc.
  • the packet size will have the main impact on the transport format. For small packets only a limited number of resources need to be allocated (e.g. codes, frequencies, time slots). Even if a low code rate is used to make the transmission more reliable there may not be a need for higher order modulations, etc. and a low MCS level could be used. Therefore based on these parameter the transmitter can select an additional or reserved or HARQ process.
  • resources e.g. codes, frequencies, time slots.
  • the simplest form of a scheduling algorithm in the Node B is non-predictive scheduling. This method maximises overall system throughput by scheduling always the user having the best channel condition at a given time instant relative to other users. It should also be noted that the performance of the algorithm depends on the aggressiveness in MCS assignment. Should the scheduler allocate always the highest possible MCS, it may occur that all HARQ processes except reserved or additional ones are in the state of packet combining. These processes must not be used in order to avoid flushing of data. If an additional process with limited functionality is used in the current TTI, the MCS is not only selected based on channel conditions, but also so that available soft buffer is not exceeded.
  • Another form of scheduling algorithm is predictive scheduling wherein a number of TTI are scheduled in advance. If different data flows are scheduled consecutively to a UE, an intelligent HARQ process assignment can be used.
  • the scheduler should consider the transport formats required for the transmissions and select the most suitable soft buffer size needed for the different HARQ processes. With this it is ensured that always the most suitable HARQ process is used without wasting capacity of the UE soft buffer.
  • Predictive scheduling performance is a tradeoff between channel prediction accuracy and prediction length.
  • Channel prediction performance decreases with increasing prediction length.
  • channel prediction is given 6 TTIs in the future, that is a certain MCS level can be allocated to any of 6 TTls according to the predicted channel state.
  • processing time is equal to prediction horizon and one HARQ process is reserved for high priority data.
  • Data transmission to the same UE is consecutively scheduled for 6 TTls.
  • MCS vector denotes the possible MCS level according to predicted channel conditions.
  • HARQ process allocation vector denotes the number or type of process allocated to transmissions in certain TTls.
  • Round trip time is equal to prediction horizon and HARQ processes are allocated for 6 TTls in advance.
  • Resource allocation vector denotes the actual MCS level that is used in the transmissions.
  • R reserved process
  • round trip time is less than prediction horizon and is equal to 5 TTls.
  • One HARQ process is additional and with limited functionality (that is, only the lowest MCS level 1 can be used for transmission with this process).
  • Data transmission to the same UE is consecutively scheduled for 6 TTls (prediction horizon).
  • HARQ processes are allocated 5 TTls in advance, while the decision on process allocation in the 6 th TTI is deferred until receiving first feedback.
  • a NACK for process 1 has arrived, but also high priority data packets are available for instantaneous transmission. It is not possible to use processes 2-5 because feedback has not been received for them. It is not possible to use process 1 either because it is in the state of packet combining.
  • the high priority packets will preempt pending retransmission for process 1 and will be scheduled to an additional process (A).
  • A additional process
  • MCS level 1 is allocated in the resource allocation vector.
  • RLC sublayer Apart from the retransmission protocol at the MAC-hs sublayer, there can also be a retransmission protocol in RLC sublayer (if configured to work in acknowledged mode) and in reliable transport control protocol layer (e.g. TCP). To reduce latency, it may be useful to assign the packets retransmitted by higher layers to reserved/additional HARQ processes.
  • reliable transport control protocol layer e.g. TCP
  • the invention discloses an intelligent method for a flexible scheduling of multiple parallel hybrid ARQ processes while transmitting data of different priority.
  • the latency is reduced without having to flush the data bits corresponding to outstanding retransmissions in the soft buffer of the UE.
  • resource allocation parameters such as data flow ID, priority, traffic descriptor, packet size etc. associated to the data
  • the transmitter selects one of the available HARQ processes to satisfy QoS requirements.
  • the transmitter uses the available radio resources efficiently.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Communication Control (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
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EP02018086A 2002-08-13 2002-08-13 Hybrides automatisches Wiederholungsaufforderungsprotokoll Expired - Lifetime EP1389848B1 (de)

Priority Applications (13)

Application Number Priority Date Filing Date Title
EP10154980.6A EP2184884B1 (de) 2002-08-13 2002-08-13 Hybrides automatisches Wiederaufforderungsprotokoll
EP02018086A EP1389848B1 (de) 2002-08-13 2002-08-13 Hybrides automatisches Wiederholungsaufforderungsprotokoll
EP06015626A EP1710946B1 (de) 2002-08-13 2002-08-13 Hybrides automatisches Wiederholungsaufforderungsprotokoll
AT02018086T ATE349829T1 (de) 2002-08-13 2002-08-13 Hybrides automatisches wiederholungsaufforderungsprotokoll
DE60217098T DE60217098T2 (de) 2002-08-13 2002-08-13 Hybrides automatisches Wiederholungsaufforderungsprotokoll
AT06015626T ATE467958T1 (de) 2002-08-13 2002-08-13 Hybrides automatisches wiederholungsaufforderungsprotokoll
DE60236377T DE60236377D1 (de) 2002-08-13 2002-08-13 Hybrides automatisches Wiederholungsaufforderungsprotokoll
CN200810003733.5A CN101222308B (zh) 2002-08-13 2003-06-24 多个混合自动重复请求进程处理方法和装置
CNB038241358A CN100375420C (zh) 2002-08-13 2003-06-24 多个混合自动重复请求进程处理方法
PCT/EP2003/006627 WO2004019544A1 (en) 2002-08-13 2003-06-24 Multiple harq processes hangling method
US10/524,141 US7471693B2 (en) 2002-08-13 2003-06-24 Multiple HARQ processes handling method
AU2003238037A AU2003238037A1 (en) 2002-08-13 2003-06-24 Multiple harq processes hangling method
JP2004529977A JP4312716B2 (ja) 2002-08-13 2003-06-24 複数ｈａｒｑ処理ハンドリング方法

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ATE467958T1 (de) 2010-05-15
CN100375420C (zh) 2008-03-12
WO2004019544A1 (en) 2004-03-04
JP2005536160A (ja) 2005-11-24
EP1710946B1 (de) 2010-05-12
JP4312716B2 (ja) 2009-08-12
EP2184884A2 (de) 2010-05-12
US7471693B2 (en) 2008-12-30
CN101222308A (zh) 2008-07-16
CN101222308B (zh) 2014-09-10
DE60217098T2 (de) 2007-05-03
ATE349829T1 (de) 2007-01-15
DE60236377D1 (de) 2010-06-24
DE60217098D1 (de) 2007-02-08
AU2003238037A1 (en) 2004-03-11
US20060092972A1 (en) 2006-05-04
EP1710946A1 (de) 2006-10-11
EP1389848B1 (de) 2006-12-27
CN1689262A (zh) 2005-10-26
EP2184884A3 (de) 2011-01-26

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